KR20000018495A - Electrostatic filter and its producing method - Google Patents

Abstract

PURPOSE: An electrostatic filter is provided to make the generation of static electricity generate at the corner by producing a film pattern into a square section, using polypropylene chips. CONSTITUTION: A producing method of an electrostatic filter is composed of the steps of producing the fibrillated fiber into an unwoven fabric with the punch of a needle by using a polypropylene film having 7-9micrometers of thickness and adhering a spun-bonded unwoven fabric on the surface of the unwoven fabric. Herein, it is desirable to cut by standard by using the spun-bonded unwoven fabric as an outer cover or to bend by adhering a net since the surface of the unwoven electrostatic filter is rough.

Description

Electrostatic filter and its manufacturing method

The present invention relates to an electrostatic filter and a method of manufacturing the same, and more particularly, to an electrostatic filter and a method of manufacturing the same for collecting fine dust and tobacco smoke suspended in the air using a large power.

In general, many of the filters widely used in air purifiers and purifiers, automobiles, Kevin filters, dust collectors, etc. are made of nonwoven fabrics.

Most of the subsidiary fabrics used here are made of microfiber. Thus, the nonwoven fabric filter made of microfibers generally has the following drawbacks.

In other words, due to high tissue density and less pore inside the tissue, the motivation is not smooth, and the damping effect is low.

In addition, since the fiber yarn constituting the nonwoven fabric has a circular cross section, the friction coefficient is low, and the amount of static electricity generated by friction with the air when air passes through is small, and even if the static electricity is generated, it disappears quickly. By throwing away, there is a problem that the adsorption effect of dust, dust, etc. in the air wandering around the filter does not meet expectations.

Therefore, in order to solve the above problems, the present applicant is rich in the amount of static electricity generated by friction when air mixed with dust or dust in Korean Patent Publication No. 1884 No. 90-3834 passes through a filter. In addition, a "non-woven fabric filter and its manufacturing method" have been proposed in which the static electricity thus obtained is permanently retained in the filter, thereby greatly improving the adsorption efficiency of dust and dust mixed in the air to pass therethrough.

That is, the fiber yarn is selected as polypropylene, and the polypropylene yarn at this time is about 0.008-0.009 mm in thickness and 0.01-0.015 mm in width. Polypropylene yarn having a thickness of 0.008mm has a drawback similar to that of a conventional microfiber even when manufactured with a nonwoven fabric, and if it is more than 0.009mm, the surface of the polypropylene yarn is closely adhered to each other, such as an interview phenomenon. Problems with

Moreover, in the case of width | variety, since the phenomenon similar to this is concerned, the conditions within the above range are preferable.

However, the length of the polypropylene yarn is not particularly limited, but if it is too short or too long, nonwoven fabric is difficult, so it is generally limited to 25-67 mm.

When the polypropylene yarn is heated in a state arranged in a negative direction, a nonwoven fabric made of polypropylene yarn is obtained. Since the polypropylene yarn is thermoplastic, it can be easily manufactured into a nonwoven fabric only by heating.

In addition, due to the limitation of the use of filter material, it is absolute to manufacture in a method effective for preventing air pollution and not harmful to the human body.

Therefore, adhesives, such as starch, PVA carboxymethyl, and casein alkate, completely exclude the use.

The nonwoven fabric thus prepared was cut by use and specification to be a core material, and a filter was manufactured by heating all the edges of the core material with the nonwoven fabric made of thermoplastic microfiber in polypropylene polyethylene.

However, the filter manufactured as described above also had a problem in that the air permeability was low, the pressure loss was large, and the life was short.

The present invention is to solve the above problems, to make a film using a polypropylene chip (Chip), unlike other fibers to make a square cross-section to induce the generation of static electricity especially in the corner portion There is.

Another object is to maximize the generation of static electricity by sharpening the surface by corona treatment or needle.

In order to achieve the above object, the present invention is characterized in that in the electrostatic filter for collecting fine dust and tobacco smoke suspended in the air, the polypropylene constituting the electrostatic filter forms a square cross-section yarn.

In addition, by using a polypropylene film having a thickness of 8㎛ ± 1 to prepare a myofiber fibers by a needle punch, characterized in that the step of adhering a spunbonded nonwoven fabric on the surface of the nonwoven fabric.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In general, the collection of fine dusts between 0.1 μm and 1 μm, in particular 0.3 μm, was difficult.

Therefore, in the present invention, 0.3㎛ dust was made possible to collect by using the electrostatic force by using the property of floating in the air by the diffusion action.

That is, in order to collect the fine dust floating in the air, a nonwoven filter was prepared by having a polypropylene film chip having a thickness of 8 μm ± 1 with a square cross-section.

Unlike other fibers, it is made of a square cross-section, the use of the property that the generation of static electricity, especially in the corner portion.

In addition, the surface is sharpened by the corona treatment or the needle to maximize the generation of static electricity.

After making the film using the polypropylene chip treated as described above, the myofibrilized fiber sheet is cut into 50 to 60 mm.

The rooted polypropylene fiber is manufactured in the form of a nonwoven fabric through a special cutting process.

In order to maximize the filtering effect, a fine amount of additive is used.

The filter thus manufactured has excellent charge preservation for a long time, so the collection efficiency is high, and the friction voltage is maintained under high temperature / high humidity.

At this time, if the thickness of the fiber is too thick, the surface joining phenomenon occurs in the time of polypropylene, so there is a problem in breathability, so it is preferable to set the structure of the most ideal fiber, that is, the thickness of about 8 µm and about 0.01 to 0.015 mm in width.

In addition, since the process water content is 'zero', the polypropylene yarn needs to maintain 90% or more of the inter-process humidity rate when making the nonwoven fabric.

Since the nonwoven fabric of the electrostatic filter is rough as described above, it is preferable to use a spunbonded nonwoven fabric as the skin to cut the sheets according to specifications or to bond the nets.

As described above, the present invention, by collecting the fine dust and tobacco smoke scattered or diffused in the air by the electrostatic force through both sides of the filter charged with each other, it is excellent in breathability and excellent charge retention power for long time use It has the effect of making it possible.

Claims (2)

In the electrostatic filter for collecting fine dust and tobacco smoke suspended in the air, Electrostatic filter, characterized in that the polypropylene constituting the electrostatic filter to form a square cross-section yarn. Manufacturing an electrostatic filter using a polypropylene film having a thickness of 8 μm ± 1 to produce a nonwoven fabric by a needle punch, and attaching a spunbonded nonwoven fabric to a surface of the nonwoven fabric. Way.